A man goes uphill with an average speed of 35 km/hr, and covers down with an average speed of 45 km/hr. The distance travelled in both the cases being the same , the average speed for the entire journey is?
Aptitude
Time and Distance
Choose an option
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A38 3/8 km/hr.
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B39 3/8 km/hr.
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C40 km/hr
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DNone of these
Answer
Correct Answer: 39 3/8 km/hr.
Explanation
Average speed = 2uv / (u + v) = ( 2 x 35 x 45) / (35 + 45) km/hr. = 39 3/8 km/hr